Question

Escalona, resolva e classifique os sistemas. a) {x + y =4
{x - y =-2
{5x + 2y =11

Answer 1

X --- Y ---
1 ---- 1 ---- 4 *
1 --- -1 ---- -2
5 ----2 ---- 11
0 --- -2 --- -6 *
0 --- -3 --- -9

X + y = 4
0 -2y = -6
0 -3y = -9

y = 3

X + 3 = 4
X = 1

Esse sistema é SPD